268397191 has 2 divisors, whose sum is σ = 268397192. Its totient is φ = 268397190.

The previous prime is 268397153. The next prime is 268397201. The reversal of 268397191 is 191793862.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 268397191 - 2¹⁹ = 267872903 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (268398191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134198595 + 134198596.

It is an arithmetic number, because the mean of its divisors is an integer number (134198596).

Almost surely, 2^268397191 is an apocalyptic number.

268397191 is a deficient number, since it is larger than the sum of its proper divisors (1).

268397191 is an equidigital number, since it uses as much as digits as its factorization.

268397191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 46.

The square root of 268397191 is about 16382.8322032547. The cubic root of 268397191 is about 645.0489244382.

The spelling of 268397191 in words is "two hundred sixty-eight million, three hundred ninety-seven thousand, one hundred ninety-one".